Rotary pump



5 Sheets-Sheet l y HVVENTUR. )Ww 12v/wm Mm R.M%DOUGALL ROTARY PUMP May z3, 195o Filed Aprill17, 1946 May 23 1950 R. MacDoUGALl. I 2,508,678

. ROTARY PUMP Filed April 17, 194e s sheets-sheet 2 IN VEN TOR.

R. Ma-CDOUGALL May 23, 1950 ROTARY PUMP 5 Sheets-Sheet 3 Filed April 17, 1946 76M ww BWMM. Ms ToYne.

3 tatable in bearings 28 in the casing. The hub is engaged by one end of a shaft 29, connected with the driveshaft 30 of an electric motor 3l, by means of couplings 32. The motor 3l is also supported on the base 24.

The inner face of the rotor 25 is provided with a plurality of vanes 35 and 36, of a turbine type, the first of which extend from the hub 21 to the periphery of the rotor, and the latter of which only extend a short ways in from the circumference. Between the vanes near the center are spaces 31, developing outwardly into channels 38, extending to the circumference of the rotor. The inner ends of the vanes 35 are formed integrally with the hub 21, and at intervals coinciding with the positioning of said vanes the hub is provided with openings 39, communicating with the spaces 31. In the inner end of the hub is a cone 21a, diverting water coming in thru the bore [4.

On the lower side of the casing Il is a Water conduit 40 (Fig. 3), in an enlargement 40a of the casing, with the outer end of which is connected a tubular conductor 4t, of circular form, to lend a minimum of resistance to the flow of the liquid therethrough. The opposite end of the conductor 4l is held in a collar 4'2 on the cylinder I3, and connected with an opening in the upper part of said cylinder. The combined passage 40 and conductor 4l comprise the first stage of the pump, and water entering the cylinder and passing outwardly therethrough by the friction force created by the rotor varies. is carried through said rst stage and back into the central cylinder, from which it is carried into the second stage, consisting of a conduit 43 on the upper part of the casing Il, in an enlargement 44, which conduit ends in an outlet at 45. Connection can be made with said conduit for the discharge of the liquid as desired. In the upper part of the casing is a block 46, positioned so as to prevent any rearward movement of the water or mingling thereof between the two passages. At the lower side of the casing is a block 41, forming an additional separation for the passages 4U and 43, and preventing a return movement of the water. The primary movement carries the water into the conduit 40 and the conductor 4l and back to the center of the pump, as

.before mentioned, and then outwardly again through the conduit 43, the second flow being separated from the primary flow in the manner hereinafter described.

The blocks 45 and 41 eut off approximately thirty-six degrees at each side of the casing, as between points indicated by broken lines C and D at the upper side of Fig. 3 and by the broken lines E and F at the lower side of said ngure, and as before mentioned the rotor is provided on its face with ve water passage sections, each subdivided and forming ten passages in all, with a multiple suction capacity and driving force. This number of sections can be varied, but is preferred.

Adjacent to the rotor 26 is a circular plate 48, integral with a hub 49, having a reduced end portion rotatable within a bearing 5U in a. cylindrical extension 52 of the casing plate 20. The rotor 2E and plate 48 are united by screws 5I, so as to rotate as a unit. The plate 2U has a further extension 53, closed by a. plate 54, and between said extension and the shaft 29 is a packing ring 55. The plate 48 encircles the inner end of the hub 21.

The diversion *of the flow of liquid in the primary movement to and through the first stage apparatus, and in the secondary movement to that of the second stage is controlled by means of the distributor I9, before referred to which is shown more particularly in Figs. 6 to 9, inclusive, and which includes a cylindrical lbody portion 60 and reduced end portion 6l, formed by a cut away channel 62 on the lower side of the member and a cutaway channel E3 on the upper side thereof. In the end of the part 6| is a recess 64 conforming to the shape of the cone 21a. in the inner end of the hub 21. One edge of the channel 6l is curved as at B6, and when the distributor is in its normal position water entering the intake IE, by the suction force of the impeller is diverted into the cylinder 21, and out through the openings 39 on the lower side of the distributor. The side edges of the end piece 6| are tapered toward the inner end, and the inner walls of the hub 21 are correspondingly tapered, so that the water is prevented from passing from one side of the distributor to the other. As a consequence the liquid which first enters the hub 21 is carried outwardly through openings 39 at the lower side thereof, and is drawn into the first stage. Upon its return through conductor 4| it passes to the upper side of the distributor, and out through the openings 39 at the upper side thereof, and is forced into the second stage.

The channel 63 in the upper face of the distributor is provided with a cross-channel at 61, in line with the end of conductor 4'I, into which the stream of water is discharged from said conductor, and through which it ls directed into the channel 6l and upper part of the cylinder.

As before stated, the water passages of the impeller are so constructed and arranged as to cause the water handled thereby to be boosted along to prevent loss of velocity and to counteract any tendency of the liquid eddying back into the following side of the impeller vanes. It has also been demonstrated that by the use of a single impeller and dou-ble stage of liquid flow, as set forth herein, and by increasing the size of the water passages, double the amount of pressure can be generated than that of the usual single impeller pump.

Changes can be made in the manner of construction and operation of the various parts of the invention, without departing from the spirit thereof, as set forth and claimed herein.

What I claim, and desire to secure, is:

1. In a pump, a casing provided with primary and secondary water passages, and means for discharge from said secondary passage, an impeller rotatably mounted in said casing provided with a plurality of turbine channels communicating outwardly with said water passages, means for rotating said impeller, means for supplying said impeller with a volume of water at a central point, communicating with said channels at their ends, means for conducting a stream of water from said primary passage to said central point, forming with said primary passage a, nrst stage of flow, and means for the control of flow of said water at said central point, to divert it in the rst instance into said primary passage and in the second instance into the secondary passage, forming the second stage of movement thereof.

2. In a rotary pump having a casing capable of a rst and second stage of movement therein, and an impeller mounted therein for rotation provided with a plurality of turbine channels operating outwardly in said casing, a central cylindrical intake having a plurality of openings communicating with said channels, a rst stage of movement adapted to receive a volume of water from said impeller channels, and having con nections to convey the water back to said intake, a secondary stage of movement and discharge therefor, and a distributing member operating in said intake, to divert the water from said intake successively into said first stage and into the secondary stage, with a multiple amount of force.

3. In a rotary pump, having a casing, and irnpelier rotatably mounted therein, provided. with a plurality cf turbine channels, operating outwardly, an intake comprising a cylindrical member provided with outlets into the impeller channels, and a distributor supported in said intake, =compelling a discharge of liquid therefrom at the lower side oi the distributor into the lower circumference of the impeller, and from the upper side of the distributor into the upper eircurnierence of the impeller, and an outlet therefor.

4. In a rotary pump having a casing provided with conduits for a first and second stage cf movement therein, and outlet therefor and an impeller mounted therein for rotation provided with a plurality of channels operating outwardly into said first and second stages, a central cylindrical intake having a plurality of openings into the impeller channels, and a distributor device in said intake, having a circular body portion and channels on opposite sides for diverting the water in the rst operation to channels on the lower side of the impeller and in the second operation to channels on the upper side thereof.

5. In combination with a pump casing and support therefor, a primary water conduit in said casing, and tubular extension therefrom, a secondary water conduit and outlet therefrom, an impeller rotatably mounted in said casing for delivery of water to said conduits, provided with a plurality of turbine channels means for rotating said impeller, an intake cylinder at a central lpoint of said impeller, provided with discharge passages thereto, into said channels and a distributor member supported in said intake cylinder provided with a cut-away channel on its lower side providing a water discharge to the passages in the lower side of the cylinder, and having a cut-away channel in its upper side registering with said tubular extension and conducting the flow therefrom to passages in the upper side of said intake cylinder.

6. In a rotary pump having a casing fitted with a two-stage water movement, one of which comprises a passage having a return to a central part of the casing, and the other of which consists of a passage having a discharge outlet, and an impeller rotatably mounted in said casing provided with a plurality of turbine channels communicating outwardly with said passages, having a central cylinder with openings into the turbine channels at their inner ends, an intake cylinder centrally of the casing opening into the impeller cylinder, and a distributor in the lastnamed cylinder extending into the impeller cylinder forming a divider between the upper and lower parts thereof, to conduct a flow of liquid from the intake cylinder to the openings in the lower part of the impeller cylinder, and from the return ow from the rst stage to the openings in the upper part of the impeller cylinder.

ROBERT MACDOUGALL.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,077,520 Gentil Nov. 4, 1913 FOREIGN PATENTS Number Country Date 505,866 Germany Aug. 26, 1930 

